Hammer



FIG. 1 is a perspective view of a hammer according to the present design;

FIG. 2 is front elevational view thereof; the rear elevational view is a mirror image;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left side elevational view thereof; and,

FIG. 6 is a right side elevational view thereof.

The broken line portions of the disclosure are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a hammer, as shown and described. 